Complex Android malware believed to have infected up to 4.5M smartphones in the U.S.

As many as 4.5 million American Android smartphone users may have been fooled into somehow downloading a complex malicious program on their devices since January 2013, The New Yok Times reports, citing security company Lookout.

Called “NotCompatible,” the malware has reached its third version, which is even more sophisticated than predecessors — Lookout said about it that it “has set a new bar for mobile malware sophistication and operational complexity.”

A user with an infected device might notice increased battery life consumption and/or higher-than-usual data consumption, without realizing what’s actually happening.